Valve grinder



Aug. 18,- 1925. 1,550,530

\ J.-H. FLYNN ET AL VALVE GRINDER Filed Oct. 19, 19 .5

' m VIII Jbkn/ fl. Flynn Wi -Hubert WITNESSzM ATTORNEY Patented Aug. 18,1925.

UNITED STATES PATENT OFFICE.

JOHN H. FLYNN AND THOMAS P. TOLBERT, 0F GREENVILLE, SOUTH CAROLINA, SAIDFLYNN ASSIGNOR TO SAID TOLBERT.

VALVE GRINDER.

Application filed October 19, 1923.

To all whom it may concern:

Be it known that we, JOHN H. FLYNN and THOMAS P. TOLBERT, citizens ofthe United States, residing at Greenville, in the county of Greenvilleand State of South Carolina, have invented new and useful Improvementsin Valve Grinders, of which the following is a specification.

This invention relates to internal combustion engines and has for itsobject the provision of an attachment in the nature of an automaticvalve grinder which intermittently rotates the valve and its stem as thelatter is opened and closed thereby keeping the valve and its seat freefromcarbon deposits and eliminates the cause and necessity for grindingthe valves.

It is also the purpose of the present invention to construct theattachment for the above mentioned purpose which can be installed foruse without any material alterations in the valve structure, the onlyalterations being the provision of. a spiral groove in the valve stem,means being provided so that the rotation of the valve and the grindingeffect can be dispensed with at any time.

The nature and advantages of the invention will be better understoodwhen the following detailed description is read in connection with theaccompanying drawing, the invention residing in the construction,combination and arrangement of parts as claimed.

In the drawing forming part of this application, like numerals ofreference indicate similar parts in the several views, and wherein:

Figure 1 is a fragmentary view of an internal combustion engine showingthe valve construction and the application of the valve grinderattachment.

Figure 2 is a detail view of the valve.

Figure 3 is a detail view of the body of the attachment.

Referring to the drawing in detail, 10 indicates a valve of the typeusually employed in internal combustion engines, and wherein the stem ofthe valve is indicated at 11. This stem normally reposes upon the liftrod 13 which operates through a suitable guide 12.

The attachment forming the subject matter of this invention includes ashell or cast- Serial No. 669,619.

ing 14 designed to fit over the lift rod guide to which it is secured orfixed relatively by means of a screw or other suitable fastening element15. This shell is formed with a reduced end portion 16 to closelysurround the valve stem 11, being of a diameter to permit of freemovement of the valve. An adjustable thumb screw 17 is carried by thisreduced end portion and is adapted to be re-. ceived by a spiral groove18 formed in the valve stem 11 and of proper length to cause the valveto rotate incident to the opening movement thereof. Consequently, whenthe valve is opened and closed in the usual manner, it is given apartial rotation so as to provide for a grinding action between thevalve and its seat, thereby preventing an accumulation of carbon beneaththe valve or around the seat. It is needless to say that under suchconditions the motor operates with maximum efliciency, and eliminatesthe trouble and expense of having the valves ground ever so often.Should it be desired to discontinue the rotation of the valve and thegrinding effect at any time, it is only necessary to turn the adjustingscrew to remove it out of the spiral groove of the stem and thisadjustment can be made in a few seconds. Carried upon the thumb screw 17is a jam nut 19 which prevents retrograde movement of the screw 17.After the thumb screw 17 has been properly adjusted, the jam nut isscrewed tight against the portion 16 of the shell, thus preventing thescrew 17 from being loosened by the vibration of the motor, or from anyother reason. The nut 19 is preferably provided with flat sides 20 sothat a wrench may be used in tightening the same.

Vhile it is believed that from the foregoing description, the nature andadvantages of the invention will be readily apparent, I desire to haveit understood that I do not limit myself to what is herein shown anddescribed and that such changes may be guide, means forholding the shellfixed relamovement is imparted to the valve stem tive to the guide saidshell having a reduced as the latter reclprocates for the purposeportion arranged to surround the valve specified. 10

stem said stem having a spiral groove, and In testimony whereof We aflixour signaan adjusting screw carried by the reduced tures. 7

portion of the shell and adapted to be re- JOHN H. FLYNN. ceived by saidgroove whereby rotat-ive THOMAS P. TOLBERT.

